Follow the OS-specific instructions below. # Linux Install [**devkitARM**](http://devkitpro.org/wiki/Getting_Started/devkitARM). Make sure that there is an environment variable called DEVKITARM with the path of the directory before the "bin" directory containing "arm-none-eabi-as", "arm-none-eabi-cpp", "arm-none-eabi-ld" and "arm-none-eabi-objcopy". Then get the compiler from https://github.com/pret/agbcc and run the following commands. ./build.sh ./install.sh PATH_OF_POKEEMERALD_DIRECTORY Then in the pokeemerald directory, build the tools. ./build_tools.sh Finally, build the rom. make # Windows Install [**devkitARM**](http://devkitpro.org/wiki/Getting_Started/devkitARM). Then get the compiled tools from https://github.com/pret/pokeruby-tools. Copy the `tools/` folder over the `tools/` folder in your pokeemerald directory. You can then build pokeemerald using `make` in the MSYS environment provided with devkitARM.